After reading many good reviews on Northstar sprayers(Northern Tool), I recently purchased one. Got the 16gal, 2.2gpm pump, with the boomless broadcast arm. I took it for a test drive in the yard with just water and have a couple of questions. First, should I go ahead and purchase replacement brass nozzles for the wand and broadcast spray arm? They work well enough but seem to dump ALOT of liquid. Second, could anyone give me a reasonable estimate on how many gallons per acre it will take to spray glyphosate on my throw and mow fields? I know there are variables but a good estimate would be nice since I will be hauling water to the land when we spray.